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EP0296339A1 - Cooling device for a computerised tomography apparatus - Google Patents

Cooling device for a computerised tomography apparatus Download PDF

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Publication number
EP0296339A1
EP0296339A1 EP88107036A EP88107036A EP0296339A1 EP 0296339 A1 EP0296339 A1 EP 0296339A1 EP 88107036 A EP88107036 A EP 88107036A EP 88107036 A EP88107036 A EP 88107036A EP 0296339 A1 EP0296339 A1 EP 0296339A1
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EP
European Patent Office
Prior art keywords
electronics
cooling
detector
circuit boards
rotating frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88107036A
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German (de)
French (fr)
Inventor
Wolf-Udo Dr. Harke
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0296339A1 publication Critical patent/EP0296339A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A61B6/035—Mechanical aspects of CT
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4488—Means for cooling

Definitions

  • the invention relates to a computer tomograph with a rotating frame, on which an x-ray emitter, a radiation detector and an electronics downstream thereof are arranged.
  • the invention has for its object to design a computer tomograph of the type mentioned in such a way that effective cooling of the electronics is ensured.
  • the rotating frame carries a closed cooling circuit in which the evaporator is arranged in the form of cooling coils on the electronics and the condenser at a distance from the detector with the electronics.
  • intensive cooling of the electronics is ensured in that the evaporator of a cooling circuit is arranged directly adjacent to it, via which the heat generated in the electronics is dissipated.
  • a particularly expedient embodiment of the invention with rapid heat dissipation consists in the construction of the electronics from a series of printed circuit boards, which are approximately aligned with the focus of the X-ray emitter, in that this series is covered by a cooling coil on its side near and out of focus, whereby Cooling air can flow through the spaces between the circuit boards and the cooling coils.
  • housing parts of the electronics are also carried out with a view to optimal heat dissipation.
  • Housing parts can also be black on their surface.
  • the computer tomograph according to Fig. 1 has a rotating frame 1 on which an X-ray source 2 and one of a number of individual detectors, e.g. consisting of 512 individual detectors, existing radiation detector 3 are attached.
  • the x-ray emitter 2 is assigned an aperture for fading in a fan-shaped x-ray beam 4, the edge rays of which affect a measuring field 6 when the rotating frame 1 rotates about an axis 5.
  • a patient couch 7 with the patient 8 to be examined lies in the measuring field 6.
  • the individual detectors of the radiation detector 3 When the patient 8 is irradiated in different directions by rotating the rotating frame 1, the individual detectors of the radiation detector 3 generate electrical signals, from which a computer 9 calculates an image of the examined transverse layer of the patient 8 and displays it on a display device 10.
  • Electronics 11 are assigned to radiation detector 3 and are arranged in a housing.
  • the electronics 11 contains a series of printed circuit boards which are aligned approximately to the focus 12 of the X-ray emitter 2.
  • the electronics 11 are used in particular to integrate the output signals of the individual detectors.
  • a closed cooling circuit with a compressor 13, a condenser 14 and an evaporator described in more detail in connection with FIGS. 2 to 4 is provided in the electronics 11 on the rotating frame 1.
  • a fan 15 blows air through a line 16 through the spaces between the circuit boards of the electronics 11 and ensures rapid heat dissipation.
  • Fig. 2 shows the housing 17 of the electronics 11 with the circuit boards 18 in a view from above, i.e. from the radiation detector 3.
  • a multiply wound cooling coil 19 of the evaporator of the cooling circuit covers the printed circuit boards 18, between which air is blown through by the blower 15 via the line 16. This air is also discharged through the line 16 designed as a double line.
  • Fig. 3 shows a side view of the electronics 11 with the housing 17 open. From Fig. 3 it can be seen that in addition to the cooling coil 19, another cooling coil 20 is arranged on the underside of the electronics 11 facing away from the radiation detector 3, which together with the Cooling coil 19 forms the evaporator of the cooling circuit, which is connected via a line 21 to the compressor 13 (FIG. 1).
  • FIG. 4 shows the view of the electronics 11 with the printed circuit boards 18 and the cooling coil 20 from below. 4, the line 16 for the supply of air to the blower 15 is shown.
  • the line 16 is a double line through which on the one hand the supply air and on the other hand the exhaust air is returned to the blower 15.
  • the housing 17 can consist of sheet steel, but the cooling coils 19, 20 can be mounted on an aluminum sheet because of the better thermal conductivity. This aluminum sheet can be black anodized to achieve a low thermal resistance.
  • the bottom and the lid of the housing 11 can also consist of polished steel sheet. This is a higher thermal resistance ensures that heat is not radiated to the outside, but is only removed via the cooling circuit. In addition, a high-frequency-tight housing is formed.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Pulmonology (AREA)
  • Theoretical Computer Science (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

Zur Wärmeabfuhr der dem Strahlendetektor (3) zugeordneten Elektronik-Schaltkreise (11) sind deren Leiterplatten (18) auf ihrer detektornahen und detektorfernen Seite von je einer Kühlschlange (19, 20) eines geschlossenen Kühlkreislaufes bedeckt. Durch die Zwischenräume der Leiterplatten (18) wird Luft geblasen, welche die Wärme nach den Kühlschlangen (19, 20) abführt.In order to dissipate heat from the electronic circuits (11) assigned to the radiation detector (3), their circuit boards (18) are covered by a cooling coil (19, 20) of a closed cooling circuit on their side near the detector and far from the detector. Air is blown through the spaces between the printed circuit boards (18), which dissipates the heat after the cooling coils (19, 20).

Description

Die Erfindung betrifft einen Computertomograph mit einem Dreh­rahmen, auf dem ein Röntgenstrahler, ein Strahlendetektor und eine diesem nachgeschaltete Elektronik angeordnet sind.The invention relates to a computer tomograph with a rotating frame, on which an x-ray emitter, a radiation detector and an electronics downstream thereof are arranged.

Bei einem Computertomographen dieser Art besteht das Problem, die Wärme, die von den Komponenten auf dem Drehrahmen erzeugt wird, abzuführen. Hierzu ist es durch die deutsche Patentanmel­dung 34 36 867 bekannt, zwischen dem Drehrahmen und dem fest­stehenden Teil einen Kanal vorzusehen, der von einem Kühlmittel durchströmt wird und in den Kühlrippen des Drehrahmens ragen.The problem with a computed tomography scanner of this type is to dissipate the heat that is generated by the components on the rotating frame. For this purpose, it is known from German patent application 34 36 867 to provide a channel between the rotating frame and the fixed part, through which a coolant flows and which protrude into the cooling ribs of the rotating frame.

Der Erfindung liegt die Aufgabe zugrunde, einen Computertomo­graphen der eingangs genannten Art so auszubilden, daß eine effektive Kühlung der Elektronik sichergestellt ist.The invention has for its object to design a computer tomograph of the type mentioned in such a way that effective cooling of the electronics is ensured.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß der Dreh­rahmen einen geschlossenen Kühlkreislauf trägt, bei dem der Verdampfer in Form von Kühlschlangen an der Elektronik und der Kondensator im Abstand vom Detektor mit der Elektronik ange­ordnet ist. Bei dem erfindungsgemäßen Computertomographen ist eine intensive Kühlung der Elektronik dadurch sichergestellt, daß ihr unmittelbar benachbart der Verdampfer eines Kühlkreis­laufes angeordnet ist, über den die in der Elektronik ent­stehende Wärme abgeführt wird.This object is achieved in that the rotating frame carries a closed cooling circuit in which the evaporator is arranged in the form of cooling coils on the electronics and the condenser at a distance from the detector with the electronics. In the computer tomograph according to the invention, intensive cooling of the electronics is ensured in that the evaporator of a cooling circuit is arranged directly adjacent to it, via which the heat generated in the electronics is dissipated.

Eine besonders zweckmäßige Ausgestaltung der Erfindung mit schneller Wärmeabfuhr besteht bei dem Aufbau der Elektronik aus einer Reihe von Leiterplatten, die etwa auf den Fokus des Rönt­genstrahlers ausgerichtet sind, darin, daß diese Reihe auf ihrer fokusnahen und fokusfernen Seite von je einer Kühlschlan­ge abdeckt ist, wobei Kühlluft durch die Zwischenräume zwischen den Leiterplatten und die Kühlschlangen strömen kann.A particularly expedient embodiment of the invention with rapid heat dissipation consists in the construction of the electronics from a series of printed circuit boards, which are approximately aligned with the focus of the X-ray emitter, in that this series is covered by a cooling coil on its side near and out of focus, whereby Cooling air can flow through the spaces between the circuit boards and the cooling coils.

Die Materialwahl für die Gehäuseteile der Elektronik wird eben­falls im Hinblick auf eine optimale Wärmeabfuhr durchgeführt. Dabei können Gehäuseteile an ihrer Oberfläche auch schwarz aus­geführt sein.The choice of materials for the housing parts of the electronics is also carried out with a view to optimal heat dissipation. Housing parts can also be black on their surface.

Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

  • Fig. 1 eine schematische Darstellung eines Computertomographen nach der Erfindung, und
  • Fig. 2 bis 4 verschiedene Ansichten der Elektronik des Compu­tertomographen gemäß Fig. 1 mit dem zugeordneten Verdampfer.
The invention is explained below with reference to an embodiment shown in the drawing. Show it:
  • Fig. 1 is a schematic representation of a computer tomograph according to the invention, and
  • 2 to 4 different views of the electronics of the computer tomograph according to FIG. 1 with the associated evaporator.

Der Computertomograph gemäß Fig. 1 weist einen Drehrahmen 1 auf, an dem ein Röntgenstrahler 2 und ein aus einer Reihe von Einzeldetektoren, z.B. aus 512 Einzeldetektoren, bestehender Strahlendetektor 3 befestigt sind. Dem Röntgenstrahler 2 ist eine Blende zur Einblendung eines fächerförmigen Röntgenstrah­lenbündels 4 zugeordnet, dessen Randstrahlen bei der Drehung des Drehrahmens 1 um eine Achse 5 ein Meßfeld 6 tangieren. Im Meßfeld 6 liegt eine Patientenliege 7 mit dem zu untersuchenden Patienten 8.The computer tomograph according to Fig. 1 has a rotating frame 1 on which an X-ray source 2 and one of a number of individual detectors, e.g. consisting of 512 individual detectors, existing radiation detector 3 are attached. The x-ray emitter 2 is assigned an aperture for fading in a fan-shaped x-ray beam 4, the edge rays of which affect a measuring field 6 when the rotating frame 1 rotates about an axis 5. A patient couch 7 with the patient 8 to be examined lies in the measuring field 6.

Bei der Durchstrahlung des Patienten 8 unter verschiedenen Richtungen durch Drehung des Drehrahmens 1 werden von den Ein­zeldetektoren des Strahlendetektors 3 elektrische Signale er­zeugt, aus denen ein Computer 9 ein Bild der untersuchten Transversalschicht des Patienten 8 berechnet und auf einem Sichtgerät 10 wiedergibt.When the patient 8 is irradiated in different directions by rotating the rotating frame 1, the individual detectors of the radiation detector 3 generate electrical signals, from which a computer 9 calculates an image of the examined transverse layer of the patient 8 and displays it on a display device 10.

Dem Strahlendetektor 3 ist eine Elektronik 11 zugeordnet, die in einem Gehäuse angeordnet ist. Die Elektronik 11 enthält eine Reihe von Leiterplatten, die etwa auf den Fokus 12 des Röntgen­strahlers 2 ausgerichtet sind. Die Elektronik 11 dient insbe­sondere zur Integration der Ausgangssignale der Einzeldetek­toren.Electronics 11 are assigned to radiation detector 3 and are arranged in a housing. The electronics 11 contains a series of printed circuit boards which are aligned approximately to the focus 12 of the X-ray emitter 2. The electronics 11 are used in particular to integrate the output signals of the individual detectors.

Zur Kühlung der Elektronik 11 ist ein geschlossener Kühlkreis­lauf mit einem Kompressor 13, einem Kondensator 14 und einem in Verbindung mit den Fig. 2 bis 4 noch näher beschriebenen Ver­dampfer in der Elektronik 11 auf dem Drehrahmen 1 vorgesehen. Ein Gebläse 15 bläst über eine Leitung 16 Luft durch die Zwi­schenräume zwischen den Leiterplatten der Elektronik 11 und sorgt für eine schnelle Wärmeabfuhr.To cool the electronics 11, a closed cooling circuit with a compressor 13, a condenser 14 and an evaporator described in more detail in connection with FIGS. 2 to 4 is provided in the electronics 11 on the rotating frame 1. A fan 15 blows air through a line 16 through the spaces between the circuit boards of the electronics 11 and ensures rapid heat dissipation.

Die Fig. 2 zeigt das Gehäuse 17 der Elektronik 11 mit den Lei­terplatten 18 in einer Ansicht von oben, d.h. vom Strahlende­tektor 3 her. Eine mehrfach gewundene Kühlschlange 19 des Ver­dampfers des Kühlkreislaufes deckt die Leiterplatten 18 ab, zwischen denen Luft vom Gebläse 15 über die Leitung 16 hin­durchgeblasen wird. Diese Luft wird durch die als Doppelleitung ausgeführte Leitung 16 auch abgeführt.Fig. 2 shows the housing 17 of the electronics 11 with the circuit boards 18 in a view from above, i.e. from the radiation detector 3. A multiply wound cooling coil 19 of the evaporator of the cooling circuit covers the printed circuit boards 18, between which air is blown through by the blower 15 via the line 16. This air is also discharged through the line 16 designed as a double line.

Die Fig. 3 zeigt eine Seitenansicht der Elektronik 11 bei ge­öffneten Gehäuse 17. Aus der Fig. 3 geht hervor, daß außer der Kühlschlange 19 noch eine weitere Kühlschlange 20 auf der dem Strahlendetektor 3 abgewandten Unterseite der Elektronik 11 an­geordnet ist, die zusammen mit der Kühlschlange 19 den Verdamp­fer des Kühlkreislaufes bildet, der über eine Leitung 21 mit dem Kompressor 13 (Fig. 1) verbunden ist.Fig. 3 shows a side view of the electronics 11 with the housing 17 open. From Fig. 3 it can be seen that in addition to the cooling coil 19, another cooling coil 20 is arranged on the underside of the electronics 11 facing away from the radiation detector 3, which together with the Cooling coil 19 forms the evaporator of the cooling circuit, which is connected via a line 21 to the compressor 13 (FIG. 1).

Die Fig. 4 zeigt die Ansicht der Elektronik 11 mit den Leiter­platten 18 und der Kühlschlange 20 von unten. In der Fig. 4 ist die Leitung 16 für die Zuführung der Luft des Gebläses 15 dar­gestellt. Die Leitung 16 ist eine Doppelleitung, durch die ei­nerseits die Zuluft und andererseits die Abluft zurück zum Ge­bläse 15 geführt wird.4 shows the view of the electronics 11 with the printed circuit boards 18 and the cooling coil 20 from below. 4, the line 16 for the supply of air to the blower 15 is shown. The line 16 is a double line through which on the one hand the supply air and on the other hand the exhaust air is returned to the blower 15.

Das Gehäuse 17 kann aus Stahlblech besteht, wobei jedoch die Kühlschlangen 19, 20 wegen der besseren Wärmeleitfähigkeit auf einem Aluminiumblech montiert sein können. Dieses Aluminium­blech kann zur Erzielung eines geringen Wärmewiderstandes schwarz eloxiert sein. Der Boden und der Deckel des Gehäuses 11 können ebenfalls aus poliertem Stahlblech bestehen. Dadurch ist ein höherer Wärmewiderstand gewährleistet, so daß Wärme nach außen nicht abgestrahlt, sondern nur über den Kühlkreislauf entfernt wird. Außerdem ist so ein hochfrequenzdichtes Gehäuse gebildet.The housing 17 can consist of sheet steel, but the cooling coils 19, 20 can be mounted on an aluminum sheet because of the better thermal conductivity. This aluminum sheet can be black anodized to achieve a low thermal resistance. The bottom and the lid of the housing 11 can also consist of polished steel sheet. This is a higher thermal resistance ensures that heat is not radiated to the outside, but is only removed via the cooling circuit. In addition, a high-frequency-tight housing is formed.

Aus der Fig. 1 geht hervor, daß auch der Kondensator 14 durch ein auf dem Drehrahmen 1 angeordnetes Gebläse (22) gekühlt ist.1 that the condenser 14 is also cooled by a fan (22) arranged on the rotating frame 1.

Claims (2)

1. Computertomograph mit einem Drehrahmen (1), auf dem ein Röntgenstrahler (2), ein Strahlendetektor (3) und eine die­sem nachgeschaltete Elektronik (11) angeordnet sind, da­durch gekennzeichnet, daß der Drehrah­men (1) einen geschlossenen Kühlkreislauf (13, 14, 19, 20) trägt, bei dem der Verdampfer in Form von Kühlschlangen (19, 20) an der Elektronik (11) und der Kondensator (14) im Abstand vom Strahlendetektor (3) mit der Elektronik (11) angeordnet ist.1. Computer tomograph with a rotating frame (1) on which an x-ray emitter (2), a radiation detector (3) and an electronic circuit (11) connected downstream thereof are arranged, characterized in that the rotating frame (1) has a closed cooling circuit (13, 14 , 19, 20), in which the evaporator is arranged in the form of cooling coils (19, 20) on the electronics (11) and the capacitor (14) at a distance from the radiation detector (3) with the electronics (11). 2. Computertomograph nach Anspruch 1, dadurch ge­kennzeichnet, daß die Elektronik (11) eine Reihe von Leiterplatten (18) aufweist, die etwa auf den Fokus (12) des Röntgenstrahlers (2) ausgerichtet sind und daß diese Reihe auf ihrer detektornahen und detektorfernen Seite von je einer Kühlschlange (19, 20) abgedeckt ist, wobei Kühlluft durch die Zwischenräume zwischen den Leiterplatten (18) und die Kühl­schlangen (19, 20) strömen kann.2. Computer tomograph according to claim 1, characterized in that the electronics (11) has a row of printed circuit boards (18) which are aligned approximately to the focus (12) of the X-ray emitter (2) and that this row on its detector-near and detector-far side is each covered by a cooling coil (19, 20), cooling air being able to flow through the spaces between the printed circuit boards (18) and the cooling coils (19, 20).
EP88107036A 1987-05-15 1988-05-02 Cooling device for a computerised tomography apparatus Withdrawn EP0296339A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8707038U DE8707038U1 (en) 1987-05-15 1987-05-15 Computer tomography
DE8707038U 1987-05-15

Publications (1)

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EP0296339A1 true EP0296339A1 (en) 1988-12-28

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EP88107036A Withdrawn EP0296339A1 (en) 1987-05-15 1988-05-02 Cooling device for a computerised tomography apparatus

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US (1) US4831639A (en)
EP (1) EP0296339A1 (en)
JP (1) JPS63180010U (en)
DE (1) DE8707038U1 (en)

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US7372938B2 (en) 2004-11-18 2008-05-13 Siemens Aktiengesellschaft Detector unit for a computer tomograph
US7851765B2 (en) 2006-05-29 2010-12-14 Siemens Aktiengesellschaft Device and method for cooling an X-radiation detector

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US6586744B1 (en) * 2000-11-24 2003-07-01 Marconi Medical Systems, Inc. Method of cooling high density electronics
DE10058818A1 (en) * 2000-11-27 2002-06-06 Philips Corp Intellectual Pty X-ray detector cooler has flow through detector and source
CN1283211C (en) * 2001-06-07 2006-11-08 株式会社日立医药 X-ray diagnostic apparatus
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US6841784B2 (en) * 2002-07-02 2005-01-11 Ray Therapy Imaging Ab Radiation sensor device
US6931092B2 (en) * 2003-06-30 2005-08-16 General Electric Company System and method for thermal management of CT detector circuitry
US7065173B2 (en) * 2003-12-02 2006-06-20 General Electric Company Method and apparatus for thermal management of CT electronics
JP4303603B2 (en) * 2004-01-13 2009-07-29 株式会社日立製作所 Nuclear medicine diagnostic device and its detector unit
JP4365762B2 (en) * 2004-09-30 2009-11-18 株式会社日立製作所 Nuclear medicine diagnostic apparatus and method for cooling nuclear medicine diagnostic apparatus
DE102006025764B4 (en) * 2006-05-31 2008-07-31 Siemens Ag X-ray detector
US7512209B2 (en) * 2006-09-14 2009-03-31 General Electric Company Thermal stabilization methods and apparatus
US20090257548A1 (en) * 2008-04-14 2009-10-15 Ashutosh Joshi Computed tomography system
US7576330B1 (en) * 2008-04-30 2009-08-18 General Electric Company Computed tomography detector apparatus
JP5348940B2 (en) * 2008-05-09 2013-11-20 株式会社東芝 X-ray computed tomography system
CN103732145B (en) 2011-08-05 2016-08-17 东芝电子管器件株式会社 Cooler, X ray computer tomography device and the maintenance method of X ray computer tomography device
JP5902054B2 (en) * 2011-08-05 2016-04-13 株式会社東芝 X-ray computed tomography system
WO2013021919A1 (en) * 2011-08-05 2013-02-14 東芝電子管デバイス株式会社 Coolant device, x-ray computer tomography device, and x-ray computer tomography device maintenance method
DE102011087211B4 (en) * 2011-11-28 2019-06-27 Siemens Healthcare Gmbh Detector arrangement of an ionizing radiation detecting detector of an imaging system with air cooling and method for cooling the detector array
JP6433183B2 (en) 2014-07-23 2018-12-05 キヤノン株式会社 Radiation detection apparatus and radiography system
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US7372938B2 (en) 2004-11-18 2008-05-13 Siemens Aktiengesellschaft Detector unit for a computer tomograph
US7851765B2 (en) 2006-05-29 2010-12-14 Siemens Aktiengesellschaft Device and method for cooling an X-radiation detector

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Publication number Publication date
JPS63180010U (en) 1988-11-21
US4831639A (en) 1989-05-16
DE8707038U1 (en) 1988-09-15

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